Wideband Series Harmonic Voltage Compensator Using Look-Ahead State Trajectory Prediction for Network Stability Enhancement and Condition Monitoring

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

4 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)5266-5282
Journal / PublicationIEEE Transactions on Power Electronics
Volume38
Issue number4
Online published4 Jan 2023
Publication statusPublished - Apr 2023

Abstract

A wideband series harmonic voltage compensator (WSHVC) with an operating bandwidth of 10 kHz for microgrids with a plurality of grid-connected inverters (GCIs) is proposed. It generates a voltage to compensate for high-frequency harmonic voltage at the point of common coupling (PCC), resulting in a virtually zero high-frequency impedance at the aggregate output of the GCIs and, thus improving system stability. The generation of the harmonic voltage is based on predicting the state trajectory of the WSHVC after a switching period per half-switching cycle to determine the moment at which the switches in the WSHVC change their states. The PCC impedance and the equivalent impedance of the GCI network are extracted by analyzing the system response after injecting the entire system with particle-swarm-optimization (PSO) optimized multisine power disturbances. Therefore, system stability is predicted. The condition of passive components in the WSHVC is also monitored by estimating their values with the sampled state variables. A 500 VA, 1 MHz, FPGA-controlled, GaN-based prototype is evaluated on a 6.5 kVA testbed that consists of three commercial GCIs, nonlinear load, and adjustable grid impedance. A comparative study of the system performance with and without the WSHVC is conducted. Experimental results are favorably compared with theoretical predictions.

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Research Area(s)

  • Impedance, Stability criteria, Power system stability, Circuit breakers, Harmonic analysis, Voltage, Power harmonic filters, Grid impedance, harmonic filters, microgrids, predictive control, series filter, weak grid, GRID-CONNECTED INVERTER, IMPEDANCE ESTIMATION, FILTER, ROBUSTNESS

Citation Format(s)

Wideband Series Harmonic Voltage Compensator Using Look-Ahead State Trajectory Prediction for Network Stability Enhancement and Condition Monitoring. / Lai, Jacky Chun-Tak; Chung, Henry Shu-Hung; He, Yuanbin et al.
In: IEEE Transactions on Power Electronics, Vol. 38, No. 4, 04.2023, p. 5266-5282.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review